Abstract
In order to study the response characteristics of reflected trough in-seam wave in fault bearing coal seam, find out the geological structure of coal mine, and ensure the scientific and safe mining of coal mine, the physical property parameters of coal and rock samples of No.3 Coal Seam in Shuangliu Coal Mine were determined, and the three-dimensional numerical analysis model of homogeneous isotropic medium was established. The full wave field forward modeling of elastic wave equation was carried out by using the finite difference method. In this paper, the dispersion curve of No.3 Coal Seam in-seam wave detection in Shuangliu Coal Mine is studied. The results show that under the geological conditions of Shuangliu Coal Mine, the dispersion curves of in-seam wave are obviously different when the coal thickness is 1 m, 3 m, 5 m and 8 m; The dispersion curve of reflected in-seam wave in goaf is disordered, which is obviously different from that of normal coal; The Airy phase velocity of in-seam wave in No.3 coal seam of Shuangliu Coal Mine is about 100 0 m/s, and the dominant frequency is 140 Hz. The conclusions are as follows: the formation of in-seam wave in the mining area is related to the direct roof and floor, but not to the indirect roof and floor; when the wave velocity difference between the roof and floor is large, the better dispersion response of Airy phase.
Highlights
With the continuous expansion of the scale of production in the coal industry and the increase in mining depths, coal mine safety has received more and more attention, and finding out the geological conditions of coal mines is a prerequisite for ensuring safety
The results show that under the geological conditions of Shuangliu Coal Mine, the dispersion curves of in-seam wave are obviously different when the coal thickness is 1m, 3m, 5m and 8m; The dispersion curve of reflected in-seam wave in goaf is disordered, which is obviously different from that of normal coal; The Airy phase velocity of in-seam wave in No.[3] coal seam of Shuangliu Coal Mine is about 100 0 m/s, and the dominant frequency is 140 Hz
Through this research on the in-seam wave response characteristics under different geological conditions in Shuangliu Coal Mine, it is calculated that the density of the coal seam in this area is about 1.36 compared with the density of the roof and floor rock, so this area has the conditions for the formation of in-seam wave
Summary
With the continuous expansion of the scale of production in the coal industry and the increase in mining depths, coal mine safety has received more and more attention, and finding out the geological conditions of coal mines is a prerequisite for ensuring safety. In-seam wave exploration has been gradually applied to coal mine geological exploration in recent years. It is a kind of seismic exploration method. Through in-seam wave seismic detection, the geological anomaly can be detected. The in-seam wave seismic exploration method has been well applied in most mining areas across the country (Yang et al 2020; Li et al 2019; Pi et al 2013). Many scholars have conducted numerical simulation research on in-seam wave detection in coal mines and analyzed its dispersion characteristics, which have important guiding significance for inseam wave detection in coal mines (Lu et al 2016; Jiang et al 2018; Du et al 2017). The physical parameters of coal and rock samples in Shuangliu Coal Mine are measured, and the obtained data is used to establish a three-dimensional numerical simulation model, carry out forward simulation, and study the in-seam wave response characteristics, which will provide a theoretical basis for the future in-seam wave detection in the mine and surrounding areas
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